The length of the arc , as in the picture, is 22 cm and O is the center of the circle. The perimeter of the circle (circumference) is:

a) 990 cmb) 67 cmc) 176 cm
d) 88 cme) none of these answers

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What is the radius of the following circle which center is O, given that:
AB = 3x - 3 and OA = x + 3.
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The radius of the circle C in the picture is 16 cm and the point P is located 7 cm far from the center O.
What is the distance between P and the circunference of the circle C?
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Find x in the following cases:
a) s is perpendicular to b) and are tangent segments to the circle
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The circles in the picture are externally tangent. The distance between the centers is 28 cm and the difference between their radii is 8 cm. Find the length of each radius.
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Knowing that O is the center of the circle, find x in the following cases:
a) b)
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The circle as shown in the picture below, with center P and radius 2, is tangent to three sides of the rectangle ABCD. Given that the total area of the rectangle is 32, find the distance between the point P and the diagonal AC.

a) b) c)
d) e)

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AB is the diameter of the circle whose center is O and the triangle ABC is inscribed in. The quotient where the area of the triangle ACO is divided by the area of the triangle COB is:

a) b) c)
d) e)

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(FESP - 1991) An equilateral triangle ABC is inscriibed in a circle whose radius is 6 cm length. The triangle is intercepted by a diameter MN of the circle, forming a trapezoid, as shown in the picture below. We can say that the quotient of the triangle ABC area divided by the trapezoid APQC area is:

a) b) c)
d) e)

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The picture shows the rhombus ABCD and the point A is the center of the circle that has a 4 cm length radius. Find the area of the rhombus in square centimeters.

a) b) c)
d) e)

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